There are several circumstances in which it may be appropriate to seek legal advice when booking a music tour, including:

1. Negotiating contracts: When negotiating contracts with venues, tour managers, crew members, and other parties involved in the tour, it may be necessary to seek the advice of a legal expert in order to ensure that your interests are protected and that the contracts are legally binding.

2. Protecting intellectual property: If you are concerned about protecting your intellectual property, such as your music or brand, it may be wise to seek the advice of a legal expert who can advise you on the best steps to take to safeguard your rights.

3. Resolving disputes: If a dispute arises during the course of the tour, such as a disagreement with a venue or a contract issue with a tour manager, it may be necessary to seek the advice of a legal expert in order to resolve the matter in a timely and effective manner.

4. Drafting contracts: If you are drafting contracts for the first time, it may be helpful to seek the advice of a legal expert who can help you to ensure that the contracts are legally binding and protect your rights.

5. Reviewing contracts: Before signing any contracts, it may be helpful to seek the advice of a legal expert who can review the contracts and advise you on any potential risks or areas of concern.

   In general, it's a good idea to seek legal advice whenever you have any questions or concerns about a legal issue related to your music tour. A qualified attorney can provide you with the guidance and advice you need to make informed decisions and protect your rights and interests.